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Old 03/07/2018, 10:59 PM   #1
yevgenb
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Heater(s) choice

Today I found my heater behaved strange I decided itís time to upgrade. Would be two 100w heaters proper choice for 43g rank? I think general idea is to set second heater couple degrees lower for redundancy.


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Old 03/08/2018, 12:35 AM   #2
Frogmanx82
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Seems a little low to me as I have a couple 300 watt heaters on a 90. I know that a single 300 watt heater will not get me more than 10 degrees. Depends how much evaporation you get and how cold your house gets in the winter, but I would think a couple 150s would be safer. Also I'd set them at about the same temp to keep one from overworking and make sure you stay at the set point.


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Old 03/08/2018, 05:40 AM   #3
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2 x 100W should be ok for a 40G tank assuming that your ambient room temperature is no more than like 8 degrees cooler than the temperature you want to keep the tank at..
2 x 125W (or 150)would be better if you keep your room temp around 68-70..

And yes you set them at the same temp and I would recommend a controller like an inkbird blue.. Heaters are known to fail.. Having them run on a controller is a good way to help ensure that when the heater temperature controls fail it doesn't overheat your tank.

Inkbird blue is like $30 and you can plug 2 heaters right into it..
https://www.amazon.com/Inkbird-Tempe...aquarium&psc=1


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Old 03/08/2018, 06:45 AM   #4
yevgenb
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Quote:
Originally Posted by mcgyvr View Post
2 x 100W should be ok for a 40G tank assuming that your ambient room temperature is no more than like 8 degrees cooler than the temperature you want to keep the tank at..
2 x 125W (or 150)would be better if you keep your room temp around 68-70..

And yes you set them at the same temp and I would recommend a controller like an inkbird blue.. Heaters are known to fail.. Having them run on a controller is a good way to help ensure that when the heater temperature controls fail it doesn't overheat your tank.

Inkbird blue is like $30 and you can plug 2 heaters right into it..
https://www.amazon.com/Inkbird-Tempe...aquarium&psc=1


I wonder what will happens when controller fails? Thats a single point of failure.


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Old 03/08/2018, 07:54 AM   #5
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Originally Posted by yevgenb View Post
I wonder what will happens when controller fails? Thats a single point of failure.


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Not if your using heaters with internal thermostats.


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Old 03/08/2018, 08:23 AM   #6
mcgyvr
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Originally Posted by yevgenb View Post
I wonder what will happens when controller fails? Thats a single point of failure.


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If heaters thermostat fail controller shuts them off..
If controller fails.. heater thermostat shuts them off..

two points of failure would be required to cause problems..


Typically I recommend setting the heater thermostats just slightly higher than the controller.. First so that they don't shut off before the controller tells them too and second so that if you check and see that the temp is a bit higher than it should be you know the controller failed..


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Old 03/08/2018, 10:31 AM   #7
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Quote:
Originally Posted by mcgyvr View Post
If heaters thermostat fail controller shuts them off..
If controller fails.. heater thermostat shuts them off..

two points of failure would be required to cause problems..


Typically I recommend setting the heater thermostats just slightly higher than the controller.. First so that they don't shut off before the controller tells them too and second so that if you check and see that the temp is a bit higher than it should be you know the controller failed..
It's a single point of failure if the controller fails to turn on your heaters. You have much more time to save a cool tank than an overheated tank, but it's still a single point of failure. Having said that, I have no problem trusting the inkbird.


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Old 03/08/2018, 11:30 AM   #8
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It's a single point of failure if the controller fails to turn on your heaters. You have much more time to save a cool tank than an overheated tank, but it's still a single point of failure. Having said that, I have no problem trusting the inkbird.
Yes.. failing to heat is not nearly as bad as failing to stop heating..

If one is overly cautious then running a controller for each heater would be the solution to eliminate single point failures across the board..

oh and make sure you feed each from a different electrical panel fed by a different utility company in a different world.


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Old 03/08/2018, 03:59 PM   #9
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There is no way to entirely eliminate the possibility of failure. All you can do is to provide redundancy for the things most likely to fail. Heck, I run three independent switches for my ATO, yet I still had a problem once with the entire volume being dumped into the tank. Reason was almost unbelievable.


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Old 03/09/2018, 06:51 AM   #10
Nick30G
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I have about 40g of water volume here and I have a inkbird controlling two Eheim Jager 100w heaters. I would say this is about the right size for my tank. However it can take a while to heat the tank back up. I would recommend two 125w heaters...

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Old 03/10/2018, 09:25 AM   #11
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I would use 2 125w or 3 100w I would also set them maybe 2 degrees apart so that it doesn't shock the system and the chances of all of them running at once are less likely unless needed during the coldest parts of the day.


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Old 03/10/2018, 10:03 AM   #12
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There is no way to entirely eliminate the possibility of failure. All you can do is to provide redundancy for the things most likely to fail. Heck, I run three independent switches for my ATO, yet I still had a problem once with the entire volume being dumped into the tank. Reason was almost unbelievable.
I'm curious. What was the reason?


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